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List:       gdb
Subject:    Re: some questions about kernel debugging
From:       Jan Kratochvil <jan.kratochvil () redhat ! com>
Date:       2010-07-09 16:20:00
Message-ID: 20100709162000.GA25084 () host0 ! dyn ! jankratochvil ! net
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On Fri, 09 Jul 2010 17:56:35 +0200, loody wrote:
> 2010/7/9 Jan Kratochvil <jan.kratochvil@redhat.com>:
> > Besides resolving this -O2 -g problem at GCC the easy way is always to just
> > `disassemble' the code in GDB, guess from the code+source in which
> > register/memory is the value probably located and access it directly there.
> 
> I tried compile the kernel with -O1 -g but it still fail.

-O1 should be like -O2 for the debugging...

> does that mean only program compiled with -O0 -g will not get the
> error message when trying to see the variable?

Right.  If you succeed to build Linux kernel with -O0 -g (which I doubt) then
GCC should produce correct enough debug information that GDB will be happy.


Regards,
Jan

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